The NEID Earth Twin Survey. VI. Discovery of a Low-Mass Planet Orbiting HD 126053 and RV Signals Near the Rotation Periods of HD 168009 and HD 10780

@misc{gupta2026neid,
  title = {{The NEID Earth Twin Survey. VI. Discovery of a Low-Mass Planet Orbiting HD 126053 and RV Signals Near the Rotation Periods of HD 168009 and HD 10780}},
  author = {Arvind F. Gupta and Sarah E. Logsdon and Jacob K. Luhn and Evan Fitzmaurice and Suvrath Mahadevan and Paul Robertson and Eric B. Ford and Chad F. Bender and Mark R. Giovinazzi and Samuel Halverson and Te Han and Daniel M. Krolikowski and Andrea S. J. Lin and Joe P. Ninan and Michael L. Palumbo III and Leonardo A. Paredes and Jayadev Rajagopal and Arpita Roy and Christian Schwab and Gudmundur Stefansson and Ryan C. Terrien and Jason T. Wright},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.32097},
  eprint = {2609.32097},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.32097},
  note = {CC BY-NC-ND 4.0},
}

TY  - UNPB
TI  - The NEID Earth Twin Survey. VI. Discovery of a Low-Mass Planet Orbiting HD 126053 and RV Signals Near the Rotation Periods of HD 168009 and HD 10780
AU  - Arvind F. Gupta
AU  - Sarah E. Logsdon
AU  - Jacob K. Luhn
AU  - Evan Fitzmaurice
AU  - Suvrath Mahadevan
AU  - Paul Robertson
AU  - Eric B. Ford
AU  - Chad F. Bender
AU  - Mark R. Giovinazzi
AU  - Samuel Halverson
AU  - Te Han
AU  - Daniel M. Krolikowski
AU  - Andrea S. J. Lin
AU  - Joe P. Ninan
AU  - Michael L. Palumbo III
AU  - Leonardo A. Paredes
AU  - Jayadev Rajagopal
AU  - Arpita Roy
AU  - Christian Schwab
AU  - Gudmundur Stefansson
AU  - Ryan C. Terrien
AU  - Jason T. Wright
PY  - 2026
DA  - 2026/09/26
PB  - arXiv
DO  - 10.48550/arxiv.2609.32097
UR  - https://arxiv.org/abs/2609.32097
AB  - Extreme precision radial velocity (EPRV) spectrographs are making strides in extending the limits of radial velocity exoplanet detection. Perhaps the best evidence for this is how readily EPRV instruments are facilitating the discovery and detailed characterization of small-amplitude planetary signals around stars that have already been intensively monitored for decades with less stable instruments. In this paper, we use data from the ongoing NEID Earth Twin Survey (NETS) to detect and confirm the planet HD 126053 b (P=10.91 d), which is among the least massive planets (m sin i = 3.60 m M_\oplus) around solar-type stars within 25 pc. We then jointly characterize the known planet HD 168009 b (P=15.14 d; m sin i = 8.64 M_\oplus) orbiting a solar analog along with a previously unreported signal at 27.8 d which we tentatively attribute to rotational modulation of stellar activity (P_rot = 30.1 d). We also analyze and discuss periodic RV variations in HD 10780 arising from a combination of rotationally-modulated activity and a long-term activity cycle. We discuss HD 126053 b and HD 168009 b in the context of the broader small planet population and our sensitivity to long-period planets in these systems, and we comment on our capacity to disambiguate planet-induced and activity-induced radial velocity signals. HD 126053 is exceptionally RV-quiet, making it a promising target for continued RV monitoring in search of low-mass exoplanets in the habitable zone.
ER  -